#swappspy-status-image[status="on"] {
  list-style-image: url("chrome://swappSpy/skin/swappspy-on.png");
  height: 16px;
  width: 16px;
}

#swappspy-status-image[status="off"] {
  list-style-image: url("chrome://swappSpy/skin/swappspy-off.png");
  height: 16px;
  width: 16px;
}